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Its not the thickness really that is the big question, its the resistance of the actual wire inside so you get a bigger charge to the plug's. They all use about the same size wire, the extra thickness is just insulation.

So if you get a set of leads with bigger wire inside and you have the factory charge going though it, your just getting more resistance, smaller spark etc..

TOVA (www.asia.vtec.net) has done a test of several different aftermarket lead sets and their conclusion was that the stock leads were best. I just looked at the dyno graph as I was skim-reading so I don't know if they were using upgraded ignition or anything, which I guess might make a difference.

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